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Capital Stock (Tables) | 3 Months Ended
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Jun. 30, 2026
Equity and Share-based Compensation [Abstract] |
Schedule of Common Shares Reserved For Future Issuance | The table below presents common shares reserved for future issuance as of June 30, 2026:
| June 30, 2026
| (Amounts in millions)
Stock options and SARs outstanding | 20.9 |
RSUs - unvested | 13.2 |
Common shares available for future issuance | 12.7 |
Shares reserved for future issuance | 46.8 |
Schedule of Share-Based Compensation Expense | The Company recognized the following share-based compensation expense during the three months ended June 30, 2026 and 2025:
|  |  | Three Months Ended
|  |  | June 30,
|  |  |  |  | 2026 |  | 2025
|  |  |  |  | (Amounts in millions)
Share-Based Compensation Expense: |  |  |  |  |  |  |
Stock options |  |  |  |  | $ | 1.2 |  |  | $ | 0.1 |
Restricted share units and other share-based compensation |  |  |  |  | 39.1 |  |  | 2.5 |
Share appreciation rights |  |  |  |  | — |  |  | 0.2 |
|  |  |  |  | 40.3 |  |  | 2.8 |
Impact of accelerated vesting on equity awards(1) |  |  |  |  | 0.8 |  |  | (1.1) |
Total share-based compensation expense |  |  |  |  | $ | 41.1 |  |  | $ | 1.7 |
___________________ (1)Represents the impact of the acceleration of vesting schedules for equity awards pursuant to certain severance arrangements. Share-based compensation expense, by expense category, consisted of the following:
|  |  | Three Months Ended
|  |  | June 30,
|  |  |  |  | 2026 |  | 2025
|  |  |  |  | (Amounts in millions)
Share-Based Compensation Expense: |  |  |  |  |  |  |
General and administration |  |  |  |  | $ | 40.3 |  |  | $ | 2.8 |
Restructuring and other |  |  |  |  | 0.8 |  |  | (1.1) |
Total share-based compensation expense |  |  |  |  | $ | 41.1 |  |  | $ | 1.7 |
Schedule of Activity of Stock Option and Share Appreciation Rights | The following table summarizes the activities during the three months ended June 30, 2026 related to the Company’s stock options and SARs:
| Number of Shares |  | Weighted Average Exercise Price (per share)
| (Amounts in millions, except per share amounts)
Outstanding as of March 31, 2026 | 16.9 |  |  | $ | 14.67 |
Granted(1) | 4.5 |  |  | $ | 11.07 |
Options exercised | (0.5) |  |  | $ | 10.20 |
Forfeited or expired | — |  | (2) | $ | 14.88 |
Outstanding as of June 30, 2026 | 20.9 |  |  | $ | 14.01 |
Vested or expected to vest as of June 30, 2026 | 20.8 |  |  | $ | 14.01 |
Exercisable as of June 30, 2026 | 16.2 |  |  | $ | 14.85 |
___________________ (1) Represents market-based equity awards granted to a certain executive officer of the Company. (2) Represents less than 0.1 million shares.
Schedule of Activity of RSU | The following table summarizes the activities during the three months ended June 30, 2026 related to the Company’s unvested RSUs:
| Number of Shares |  | Weighted Average Grant Date Fair Value (per share)
| (Amounts in millions, except per share amounts)
Unvested as of March 31, 2026 | 15.9 |  |  | $ | 6.8 |
Granted(1) | 0.8 |  |  | $ | 10.88 |
Vested | (3.3) |  |  | $ | 6.67 |
Forfeited or expired | (0.2) |  |  | $ | 6.38 |
Unvested as of June 30, 2026 | 13.2 |  |  | $ | 7.11 |
___________________ (1) During the three months ended June 30, 2026, the Company granted market-based equity awards to a certain executive officer of the Company which consisted of 0.7 million RSUs.

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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